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Chapter 2: Building Discourse Representations

Chapter 2: Building Discourse Representations. November 14, 2007 Matt Gerber. DRS Construction. Claim: DRT is a flexible theory compatible with a range of construction strategies DRS threading Rehash of the SCA -DRSs -abstraction approach Underspecified DRSs Hole semantics.

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Chapter 2: Building Discourse Representations

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  1. Chapter 2: Building Discourse Representations November 14, 2007 Matt Gerber

  2. DRS Construction • Claim: DRT is a flexible theory compatible with a range of construction strategies • DRS threading • Rehash of the SCA • -DRSs • -abstraction approach • Underspecified DRSs • Hole semantics

  3. DRS threading • A different perspective on the standard construction algorithm • Syntactic constituents are “threaded” through the current DRS

  4. DRS threading • Simple IV “dances”: • Key: input/output DRS, the difference between the two being the semantic contribution of the current node

  5. DRS threading • “Mia dances”: • Unary branching rules add no semantic content

  6. DRS threading • “Every gimp runs”: antecedent formation

  7. DRS threading • “Every gimp runs”: DRS completion

  8. -DRSs • Parallel approach to sentence semantics for DRT • Create DRSs through functional application

  9. -DRSs • Addition to DRS language: the merge operation • Union of discourse referents and conditions

  10. -DRSs • Coordination caveat: “A woman walks and a woman talks.” *

  11. -DRSs • Some lexical entries (nouns):

  12. -DRSs • Some lexical entries (determiners): Previously:

  13. -DRSs • Some lexical entries (verbs):

  14. “Every woman dances”:

  15. Underspecified DRSs • Review: hole semantics • “Every boxer loves a woman”

  16. Underspecified DRSs • Review: hole semantics • Valid plugging: any that produces a formula tree and respects the dominance constraints

  17. Underspecified DRSs • Review: hole semantics • “Every boxer loves a woman” (weaker) Universal quantifier out-scopes existential quantifier

  18. Underspecified DRSs • Review: hole semantics • “Every boxer loves a woman” (stronger) Existential quantifier out-scopes universal quantifier

  19. Underspecified DRSs • Example: “Every boxer loves a woman” • Available DRS “chunks”:

  20. Underspecified DRSs • Example: “Every boxer loves a woman” • Dominance constraints • : ensures the verb is out-scoped by the two NP DRSs

  21. Underspecified DRSs • Example: “Every boxer loves a woman” Possible pluggings:

  22. Underspecified DRSs • Example: “Every boxer loves a woman” Possible pluggings: Plugging P1 Plugging P2

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